Can you snorkel in Jeju Island today?

Conditions look marginal right now — no clearly safe snorkeling window is forecast in Jeju Island over the next 72 hours. Check the hourly table for the calmest period.

What is the best time of day to snorkel in Jeju Island?

Snorkel during daylight, ideally in the morning before the wind picks up, and around high slack tide when water is clearest and currents are weakest. SnorkelForecast scores every daylight hour in Jeju Island so you can pick the calmest window.

What is the best tide for snorkeling?

High slack tide — within about an hour of the high-tide peak when currents are weakest — is the safest, clearest window. Strong low tides, strong tidal flow near channels or headlands, and large tidal-range days reduce score.

Jeju Island Snorkel Report Today

South Korea · Updated Tue 04:16 (KST) · Source: Snapshot · Showing fallback/stale data

The skinny

Marginal Report Wed 16:39

Jeju Island looks marginal today. The least-bad daylight window is around Thu 14:00, but waves is limiting the forecast.

Score: 5.1/10

Best time: Thu 14:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Wed 19:00 (Fair). Peak afternoon wind is about 3.4 m/s.

Email me when it is good

Sunrise

05:39

Sunset

19:40

Water

28.6°C

Max air

27.9°C

Sky

Partly cloudy

40% cloud

No safe window in the next 72 hours

Use the best-available section for the least-bad times.

3-day planner Best available Show data

3-day planner

Wednesday

⚠️ fair conditions

Main blocker: Waves

Thursday

⚠️ fair conditions

Main blocker: Waves

Friday

⚠️ fair conditions

Main blocker: Waves

Best available hours

Thu 05:00 — Fair (0.51) · still limited by waves, tide/current
Thu 06:00 — Fair (0.50) · still limited by waves, tide/current
Fri 03:00 — Fair (0.50) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

Waves (44 hours)
Tide/current (44 hours)
Darkness (26 hours)

Jellyfish drift risk

Drift estimate from wind, swell, current and warm water.

Low · 34/100

Low peak drift risk around Wed 18:00.

warm water supports seasonal jellyfish activity; surface drift/current is noticeable; local shoreline exposure is not mapped yet.

Sightings override the model: if you see small purple jellyfish with long trailing tentacles, treat them as sting-capable and give them space.

Upcoming high tides

Next early morning high tide: Wed 18:00

Wed 18:00, Thu 09:00, Thu 19:00

Nearby alternatives in South Korea

No nearby alternatives available.

Advanced forecast data

Viewing historical data

Tue 07:00 – Fri 07:00 (KST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.46 around Tue 19:00; 11 of 24 hours are good, fair, or excellent.

Score trend, higher is better. Excellent ≥ 0.72, good 0.55–0.72, fair 0.35–0.55.

Conditions (24h trends)

Tap a chart to load just that series.

0/24 sampled hours stay at or below 0.36m (range 0.9m to 1.38m).

Wind is at or below 5.4m/s in 24/24 sampled hours (range 0.54 to 3.26m/s).

Tides range from -0.38m to 1.03m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview

Tue 07:00 fair ⚠️ Fair

Tue 08:00 fair ⚠️ Fair

Tue 09:00 fair ⚠️ Fair

Tue 10:00 fair ⚠️ Fair

Tue 11:00 poor ❌ Limited

Tue 12:00 poor ❌ Limited

Tue 13:00 poor ❌ Limited

Tue 14:00 poor ❌ Limited

Tue 15:00 poor ❌ Limited

Tue 16:00 poor ❌ Limited

Tue 17:00 poor ❌ Limited

Tue 18:00 poor ❌ Limited

Tue 19:00 poor ❌ Limited

Tue 20:00 poor ❌ Limited

Tue 21:00 poor ❌ Limited

Tue 22:00 poor ❌ Limited

Tue 23:00 poor ❌ Limited

Wed 00:00 fair ⚠️ Fair

Wed 01:00 fair ⚠️ Fair

Wed 02:00 fair ⚠️ Fair

Wed 03:00 fair ⚠️ Fair

Wed 04:00 fair ⚠️ Fair

Wed 05:00 fair ⚠️ Fair

Wed 06:00 fair ⚠️ Fair

Wed 07:00 fair ⚠️ Fair

Wed 08:00 fair ⚠️ Fair

Wed 09:00 fair ⚠️ Fair

Wed 10:00 fair ⚠️ Fair

Wed 11:00 poor ❌ Limited

Wed 12:00 poor ❌ Limited

Wed 13:00 poor ❌ Limited

Wed 14:00 poor ❌ Limited

Wed 15:00 poor ❌ Limited

Wed 16:00 poor ❌ Limited

Wed 17:00 poor ❌ Limited

Wed 18:00 poor ❌ Limited

Wed 19:00 poor ❌ Limited

Wed 20:00 poor ❌ Limited

Wed 21:00 poor ❌ Limited

Wed 22:00 poor ❌ Limited

Wed 23:00 poor ❌ Limited

Thu 00:00 fair ⚠️ Fair

Thu 01:00 fair ⚠️ Fair

Thu 02:00 fair ⚠️ Fair

Thu 03:00 fair ⚠️ Fair

Thu 04:00 fair ⚠️ Fair

Thu 05:00 fair ⚠️ Fair

Thu 06:00 fair ⚠️ Fair

Thu 07:00 fair ⚠️ Fair

Thu 08:00 fair ⚠️ Fair

Thu 09:00 fair ⚠️ Fair

Thu 10:00 fair ⚠️ Fair

Thu 11:00 poor ❌ Limited

Thu 12:00 poor ❌ Limited

Thu 13:00 poor ❌ Limited

Thu 14:00 poor ❌ Limited

Thu 15:00 poor ❌ Limited

Thu 16:00 poor ❌ Limited

Thu 17:00 poor ❌ Limited

Thu 18:00 poor ❌ Limited

Thu 19:00 poor ❌ Limited

Thu 20:00 poor ❌ Limited

Thu 21:00 poor ❌ Limited

Thu 22:00 poor ❌ Limited

Thu 23:00 poor ❌ Limited

Fri 00:00 fair ⚠️ Fair

Fri 01:00 fair ⚠️ Fair

Fri 02:00 fair ⚠️ Fair

Fri 03:00 fair ⚠️ Fair

Fri 04:00 fair ⚠️ Fair

Fri 05:00 fair ⚠️ Fair

Fri 06:00 fair ⚠️ Fair

Scoring methodology (for technical users)

We score each hour from 0 to 1 using daylight and these weighted components:

Wave height (35%): best below 0.36m, then decreases as it rises.
Wind speed (25%): best below 5.4m/s, lower is better.
Sea surface temperature (15%): best within 20.6°C to 30.4°C.
Tide and currents (15%): best around slack/high-tide windows.
Daylight (10%): visibility and safety gate (outside daylight scores lower).

Detailed hourly data table

Time	Wave (m)	Wind (m/s)	Sea temp (°C)	Status
Tue 07:00	0.90 · high	2.70 · good	25.80 · good	fair
Tue 08:00	0.90 · high	2.34 · good	25.90 · good	fair
Tue 09:00	0.90 · high	1.91 · good	25.90 · good	fair
Tue 10:00	0.92 · high	1.52 · good	25.80 · good	fair
Tue 11:00	0.92 · high	1.20 · good	25.80 · good	poor
Tue 12:00	0.94 · high	1.20 · good	25.70 · good	poor
Tue 13:00	0.96 · high	1.02 · good	25.70 · good	poor
Tue 14:00	0.96 · high	1.02 · good	25.60 · good	poor
Tue 15:00	0.98 · high	1.10 · good	25.40 · good	poor
Tue 16:00	1.00 · high	0.70 · good	25.30 · good	poor
Tue 17:00	1.02 · high	0.78 · good	25.20 · good	poor
Tue 18:00	1.04 · high	0.54 · good	25.10 · good	poor
Tue 19:00	1.08 · high	1.63 · good	25.10 · good	poor
Tue 20:00	1.14 · high	1.75 · good	25.00 · good	poor
Tue 21:00	1.18 · high	1.97 · good	25.00 · good	poor
Tue 22:00	1.22 · high	2.64 · good	25.00 · good	poor
Tue 23:00	1.26 · high	3.04 · good	25.00 · good	poor
Wed 00:00	1.30 · high	3.09 · good	25.00 · good	fair
Wed 01:00	1.32 · high	3.26 · good	25.00 · good	fair
Wed 02:00	1.32 · high	3.20 · good	25.10 · good	fair
Wed 03:00	1.34 · high	2.46 · good	25.20 · good	fair
Wed 04:00	1.36 · high	2.14 · good	25.30 · good	fair
Wed 05:00	1.36 · high	1.63 · good	25.40 · good	fair
Wed 06:00	1.38 · high	1.88 · good	25.50 · good	fair
Wed 07:00	1.38 · high	1.52 · good	25.50 · good	fair
Wed 08:00	1.38 · high	1.36 · good	25.50 · good	fair
Wed 09:00	1.38 · high	1.00 · good	25.60 · good	fair
Wed 10:00	1.36 · high	0.58 · good	25.60 · good	fair
Wed 11:00	1.36 · high	0.36 · good	25.50 · good	poor
Wed 12:00	1.34 · high	0.51 · good	25.50 · good	poor
Wed 13:00	1.36 · high	0.71 · good	25.50 · good	poor
Wed 14:00	1.36 · high	0.91 · good	25.40 · good	poor
Wed 15:00	1.38 · high	0.85 · good	25.30 · good	poor
Wed 16:00	1.38 · high	1.64 · good	25.20 · good	poor
Wed 17:00	1.38 · high	1.20 · good	25.20 · good	poor
Wed 18:00	1.38 · high	0.71 · good	25.10 · good	poor
Wed 19:00	1.38 · high	0.30 · good	25.10 · good	poor
Wed 20:00	1.36 · high	0.57 · good	25.10 · good	poor
Wed 21:00	1.36 · high	0.14 · good	25.00 · good	poor
Wed 22:00	1.38 · high	0.22 · good	25.00 · good	poor
Wed 23:00	1.38 · high	0.78 · good	25.10 · good	poor
Thu 00:00	1.40 · high	0.61 · good	25.10 · good	fair
Thu 01:00	1.42 · high	1.35 · good	25.30 · good	fair
Thu 02:00	1.42 · high	1.92 · good	25.50 · good	fair
Thu 03:00	1.44 · high	2.27 · good	25.70 · good	fair
Thu 04:00	1.48 · high	2.59 · good	26.00 · good	fair
Thu 05:00	1.50 · high	2.77 · good	26.20 · good	fair
Thu 06:00	1.54 · high	2.78 · good	26.30 · good	fair
Thu 07:00	1.56 · high	2.75 · good	26.40 · good	fair
Thu 08:00	1.56 · high	2.00 · good	26.40 · good	fair
Thu 09:00	1.56 · high	1.80 · good	26.30 · good	fair
Thu 10:00	1.54 · high	1.58 · good	26.20 · good	fair
Thu 11:00	1.52 · high	2.02 · good	26.10 · good	poor
Thu 12:00	1.50 · high	2.02 · good	26.00 · good	poor
Thu 13:00	1.50 · high	1.72 · good	25.90 · good	poor
Thu 14:00	1.52 · high	1.50 · good	25.80 · good	poor
Thu 15:00	1.52 · high	1.39 · good	25.70 · good	poor
Thu 16:00	1.52 · high	1.28 · good	25.50 · good	poor
Thu 17:00	1.50 · high	1.41 · good	25.40 · good	poor
Thu 18:00	1.50 · high	1.42 · good	25.40 · good	poor
Thu 19:00	1.50 · high	1.70 · good	25.30 · good	poor
Thu 20:00	1.52 · high	1.77 · good	25.30 · good	poor
Thu 21:00	1.52 · high	1.89 · good	25.30 · good	poor
Thu 22:00	1.56 · high	1.75 · good	25.20 · good	poor
Thu 23:00	1.58 · high	1.92 · good	25.30 · good	poor
Fri 00:00	1.62 · high	1.82 · good	25.30 · good	fair
Fri 01:00	1.64 · high	2.12 · good	25.30 · good	fair
Fri 02:00	1.68 · high	2.41 · good	25.40 · good	fair
Fri 03:00	1.70 · high	2.40 · good	25.50 · good	fair
Fri 04:00	1.74 · high	2.70 · good	25.60 · good	fair
Fri 05:00	1.76 · high	3.00 · good	25.70 · good	fair
Fri 06:00	1.80 · high	3.11 · good	25.80 · good	fair